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Contribute to swiftlang/swift

Make your first contribution to this repository by tackling one of the issues listed below.

Each issue displayed here is a "good first issue," selected for its relative approachability for first-time contributors.

Good first issues

5.10 "LoadableByAddress" non-deterministic compiler crash when parameter pack closure saved to instance property. bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers IRGen LLVM IR generation generics Feature: generic declarations and types crash Bug: A crash, i.e., an abnormal termination of software function types Feature → types: function types properties Feature: properties parameter packs Feature → generics: Parameter packs types Feature: types swift 5.10 needs tests Flag: Issue is fixed but needs tests / PR needs tests
#74609 opened Jun 21, 2024 by vanvoorden
10
Variable i was never mutated in `.enumerated()` for var loop; needs fix-it to suggest `for case (let _, var _)` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis fix-its Feature: diagnostic fix-its for-in loops Feature: for-in loops patterns Feature: patterns statements Feature: statements swift 6.0 tuple patterns Feature → patterns: Tuple patterns binding patterns Feature → patterns: Binding patterns
#72811 opened Apr 3, 2024 by peterkos
9
Bad diagnostic for `any P!` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis TypeResolver existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types swift 6.0 implicitly unwrapped optionals Feature → types: Implicitly unwrapped optional types, aka IUO
#72662 opened Mar 28, 2024 by AnthonyLatsis
6
Diagnostic for use of plain protocol name in type position should suggest `some` or `any` bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis fix-its Feature: diagnostic fix-its generics Feature: generic declarations and types opaque types Feature → types: opaque types existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values swift 5.9 types Feature: types
#68284 opened Sep 1, 2023 by hborla
16
Compiler error when extending a typealias of a partially specialized generic type bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers type checker Area → compiler: Semantic analysis generics Feature: generic declarations and types TypeResolver typealias Feature → type declarations: `typealias` declarations swift 5.9 unexpected error Bug: Unexpected error extension Feature → declarations: `extension` declarations declarations Feature: declarations
#68212 opened Aug 30, 2023 by tapsns
56
`[.]Type` completion for `(any P).` shows it will produce an existential metatype bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. good first issue Good for newcomers code completion Area → source tooling: code completion source tooling Area: IDE support, SourceKit, and other source tooling existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values metatypes Feature → types: Metatypes swift 5.9 unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types
#65843 opened May 10, 2023 by AnthonyLatsis
32
Code completion: Stop suggesting old-style protocol metatype syntax in Swift 6 mode bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. good first issue Good for newcomers code completion Area → source tooling: code completion source tooling Area: IDE support, SourceKit, and other source tooling existentials Feature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased values metatypes Feature → types: Metatypes swift 5.9 unexpected behavior Bug: Unexpected behavior or incorrect output types Feature: types
#65699 opened May 5, 2023 by AnthonyLatsis
9
Optional boolean doesn't satisfy switch exhaustivity with literal case statements improvement compiler The Swift compiler itself good first issue Good for newcomers feature A feature request or implementation type checker Area → compiler: Semantic analysis literals Feature → expressions: Literals such as an integer or string literal switch exhaustivity Feature: enforcement of exhaustivity in 'switch' statements switch Feature → statements: 'switch' statements
#61817 opened Oct 31, 2022 by jpsim
14
SwiftUI: Failed to produce diagnostic for expression when using keyword 'open' in some contexts bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis failed to produce diagnostic Bug → internal error: Failed to produce diagnostic for expression swift 5.9
#61039 opened Sep 11, 2022 by j-war
14
[SR-15111] “Type of expression is ambiguous” error when initializing a class bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis type inference Feature: type inference expressions Feature: expressions swift 5.9 optional chaining Feature → expressions: optional chaining
#57437 opened Aug 25, 2021 by swift-ci
13
[SR-8213] Compiler may indicate "case will never be executed" even if it is unavoidable to execute the case in switch statement. bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis SILGen Area → compiler: The SIL generation stage pattern matching Feature: pattern matching switch Feature → statements: 'switch' statements swift 5.9 patterns Feature: patterns statements Feature: statements switch cases Feature → statements → switch: 'switch' statement cases
#50745 opened Jul 10, 2018 by YOCKOW
14
[SR-3316] "Script mode" globals have internal visibility and can be accessed before initialization from other files bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler itself good first issue Good for newcomers feature A feature request or implementation swift evolution proposal needed Flag → feature: A feature that warrants a Swift evolution proposal access control Feature → modifiers: Access control and access levels
#45904 opened Dec 2, 2016 by jckarter
1
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